:root {
    --bg: #000;
    --bg-secondary: #0a0a0a;
    --card-bg: #111;
    --card-hover: #1a1a1a;
    --primary: #f77f00;
    --primary-hover: #e06b00;
    --primary-light: rgba(247, 127, 0, 0.1);
    --text: #f0f0f0;
    --text-secondary: #b0b0b0;
    --text-muted: #666;
    --border: #f77f00;
    --border-light: #f77f00;
    --input-bg: #0a0a0a;
    --success: #4caf50;
    --danger: #f44336;
    --radius: 16px;
    --radius-sm: 10px;
    --shadow: 0 2px 12px rgba(0,0,0,0.5);
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.7);
    --transition: all 0.2s ease;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    height: 100vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

a { color: var(--primary); text-decoration: none; }

/* ==================== Header ==================== */
.header {
    background: var(--bg-secondary);
    border-bottom: 2px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(12px);
    flex-shrink: 0;
}

.header-inner {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 32px;
    height: 90px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.logo-text {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--text);
    letter-spacing: -1px;
    white-space: nowrap;
    display: flex;
    align-items: center;
    gap: 6px;
    position: absolute;
    left: 32px;
    text-decoration: none;
}
.logo-text:hover { opacity: 0.9; }
.logo-prefix { color: var(--text); }
.logo-suffix { color: var(--primary); }
.logo-icon { font-size: 1.4rem; }
.logo-img {
    height: 34px;
    width: auto;
    vertical-align: middle;
    border-radius: 6px;
    object-fit: contain;
}

.search-box {
    position: relative;
    width: 400px;
    max-width: 40vw;
}
.search-box input {
    width: 100%;
    padding: 10px 44px 10px 18px;
    background: var(--input-bg);
    border: 1px solid var(--border);
    border-radius: 24px;
    color: var(--text);
    font-size: 0.92rem;
    transition: var(--transition);
    outline: none;
}
.search-box input:focus {
    border-color: var(--primary);
}
.search-box input::placeholder {
    color: var(--text-muted);
}
.search-btn {
    position: absolute;
    right: 4px;
    top: 50%;
    transform: translateY(-50%);
    width: 34px;
    height: 34px;
    border-radius: 50%;
    border: none;
    background: var(--primary);
    color: #fff;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}
.search-btn:hover { background: var(--primary-hover); }

.nav-links {
    display: flex;
    align-items: center;
    gap: 8px;
    position: absolute;
    right: 32px;
}
.nav-link {
    padding: 7px 18px;
    border-radius: 20px;
    font-size: 0.88rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: var(--transition);
    white-space: nowrap;
}
.nav-link:hover { color: var(--text); background: #1a1a1a; }
.nav-link.active { color: var(--primary); background: var(--primary-light); }
.nav-btn-primary {
    background: var(--primary) !important;
    color: #fff !important;
    font-weight: 600;
}
.nav-btn-primary:hover { background: var(--primary-hover) !important; }

/* ==================== Main Content ==================== */
.main-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 16px 28px;
    flex: 1;
    overflow-y: auto;
    width: 100%;
}

/* ==================== Section Header + Tabs ==================== */
.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
    flex-wrap: wrap;
    gap: 12px;
}
.section-title {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text);
}

.tabs {
    display: inline-flex;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 24px;
    padding: 3px;
    gap: 2px;
}
.sort-tab {
    padding: 8px 24px;
    border-radius: 22px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
    user-select: none;
    border: none;
    background: transparent;
}
.sort-tab:hover { color: var(--text); }
.sort-tab.active {
    background: var(--primary);
    color: #fff;
}

/* ==================== Sticker Grid ==================== */
.sticker-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 12px;
}

@media (max-width: 1100px) {
    .sticker-grid { grid-template-columns: repeat(4, 1fr); gap: 12px; }
}
@media (max-width: 768px) {
    .sticker-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }
    .header-inner { padding: 0 12px; height: 68px; }
    .logo-text { font-size: 1.2rem; left: 12px; }
    .logo-icon { font-size: 1rem; }
    .nav-link { padding: 5px 10px; font-size: 0.75rem; }
    .nav-links { right: 12px; gap: 3px; }
    .search-box { width: 180px; }
    .main-content { padding: 12px; }
    .section-title { font-size: 1.1rem; }
}
@media (max-width: 480px) {
    .sticker-grid { grid-template-columns: 1fr; }
    .header-inner { flex-wrap: wrap; height: auto; padding: 14px 12px; gap: 10px; }
    .logo-text { position: static; font-size: 1.6rem; }
    .search-box { width: 100%; max-width: 100%; order: 3; flex: 1 0 100%; }
    .nav-links { position: static; order: 2; }
    .nav-link { padding: 5px 10px; font-size: 0.78rem; }
}

/* ==================== Sticker Card ==================== */
.sticker-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 10px;
    overflow: hidden;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}
.sticker-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(247, 127, 0, 0.3);
}

.sticker-card .card-img-wrapper {
    position: relative;
    width: 100%;
    padding-top: 100%;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg);
}

.sticker-card .card-img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.35s ease;
}
.sticker-card:hover .card-img {
    transform: scale(1.04);
}

.sticker-card .card-info {
    padding: 8px 10px 10px;
    display: flex;
    flex-direction: column;
    gap: 4px;
    flex: 1;
}

.sticker-card .card-title {
    font-size: 0.8rem;
    font-weight: 600;
    text-align: center;
    display: -webkit-box;
    -webkit-line-clamp: 1;
    -webkit-box-orient: vertical;
    overflow: hidden;
    color: var(--text);
}

.sticker-card .card-meta {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    font-size: 0.72rem;
    color: var(--text-muted);
}
.sticker-card .card-meta span {
    display: flex;
    align-items: center;
    gap: 3px;
    white-space: nowrap;
}

.sticker-card .card-actions {
    display: flex;
    gap: 8px;
    justify-content: center;
    margin-top: 4px;
}

/* ==================== Buttons ==================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px 22px;
    border: none;
    border-radius: 22px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-hover); }
.btn-outline {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-secondary);
}
.btn-outline:hover { border-color: var(--primary); color: var(--primary); }
.btn-sm { padding: 6px 16px; font-size: 0.8rem; border-radius: 18px; }
.btn-block { display: flex; width: 100%; }

/* ==================== Load More ==================== */
.load-more {
    text-align: center;
    margin-top: 32px;
}
.load-more .btn {
    padding: 12px 48px;
    font-size: 0.95rem;
}

/* ==================== End Message ==================== */
.end-message {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* ==================== Loading & Empty ==================== */
.loading-state, .empty-state {
    text-align: center;
    padding: 80px 20px;
    color: var(--text-secondary);
}
.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 0 auto 16px;
}
@keyframes spin { to { transform: rotate(360deg); } }
.empty-state .icon { font-size: 3.5rem; margin-bottom: 16px; }
.empty-state p { font-size: 1rem; }

/* ==================== Lazy Load ==================== */
.lazy-img { opacity: 0; transition: opacity 0.35s ease; }
.lazy-img.loaded { opacity: 1; }

/* ==================== Toast ==================== */
.toast {
    position: fixed;
    top: 80px;
    right: 28px;
    padding: 12px 28px;
    border-radius: 10px;
    color: #fff;
    font-size: 0.9rem;
    font-weight: 500;
    z-index: 2000;
    animation: toastIn 0.3s ease;
    display: none;
    box-shadow: var(--shadow-lg);
}
.toast.success { background: var(--success); }
.toast.error { background: var(--danger); }
.toast.info { background: var(--primary); }
@keyframes toastIn {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

/* ==================== Footer ==================== */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    padding: 14px 28px;
    flex-shrink: 0;
    text-align: center;
}
.footer-inner {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 24px;
    flex-wrap: wrap;
}
.footer p, .footer a {
    color: var(--text-muted);
    font-size: 0.82rem;
}
.footer a:hover { color: var(--primary); }
.footer .copyright {
    color: var(--text-muted);
    font-size: 0.78rem;
    margin-top: 6px;
}

/* ==================== Upload Page ==================== */
.upload-container {
    max-width: 640px;
    margin: 0 auto;
    padding: 20px 0;
}
.upload-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 36px;
}
.upload-card h1 {
    font-size: 1.5rem;
    margin-bottom: 6px;
    font-weight: 700;
}
.upload-desc {
    color: var(--text-secondary);
    margin-bottom: 28px;
    font-size: 0.9rem;
}
.upload-zone {
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    padding: 48px 24px;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    min-height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}
.upload-zone:hover, .upload-zone.drag-over {
    border-color: var(--primary);
    background: var(--primary-light);
}
.upload-icon { font-size: 2.8rem; margin-bottom: 14px; }
.upload-hint { color: var(--text-muted); font-size: 0.8rem; margin-top: 8px; }
.upload-preview {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
}
.upload-preview img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    background: var(--bg);
}
.preview-overlay {
    position: absolute;
    bottom: 12px;
    left: 50%;
    transform: translateX(-50%);
}
.upload-progress { margin-top: 16px; }
.progress-bar {
    height: 8px;
    background: #1a1a1a;
    border-radius: 4px;
    overflow: hidden;
}
.progress-fill {
    height: 100%;
    background: var(--primary);
    border-radius: 4px;
    width: 0%;
    transition: width 0.2s;
}
.progress-text {
    display: block;
    text-align: center;
    margin-top: 6px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}
.form-group { margin-top: 20px; }
.form-group label {
    display: block;
    margin-bottom: 6px;
    font-size: 0.9rem;
    color: var(--text-secondary);
}
.form-group input, .form-group textarea, .form-group select {
    width: 100%;
    padding: 10px 14px;
    background: var(--input-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    font-size: 0.95rem;
    transition: var(--transition);
    outline: none;
}
.form-group input:focus, .form-group textarea:focus, .form-group select:focus {
    border-color: var(--primary);
}
.upload-tips {
    margin-top: 28px;
    padding: 16px 20px;
    background: var(--input-bg);
    border-radius: var(--radius-sm);
}
.upload-tips h3 { font-size: 0.9rem; margin-bottom: 10px; color: var(--primary); }
.upload-tips ul { padding-left: 20px; font-size: 0.85rem; color: var(--text-secondary); }
.upload-tips li { margin-bottom: 4px; }

/* ==================== Scrollbar ==================== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--border-light); }